If-Modified-Since Explained
What Is If-Modified-Since? … If-Modified-Since (aka “the If-Modified-Since HTTP header”) explained. (This is an SEO-relevant question asked by web developers who want search engines to understand and rank their webpages.) “304 status code” or no “304”? Every so often, the Googlebot spider will visit your website. If you have updated your page since last time it … Read more